3pipes hot,one not

[rizzo4u2]

number 2 cylinder not firing as hot as the others, sprayed each cylinder with a shot of water after running for 30.min, no1 ,no3, no4pipes burnt the shot quickley, no 2 sprayed and then burnt off slowley, checked the coils , all are firing, no 2 is running a lot colder than the others, any ideas

[Ken Talbot]

Carb #2 is not delivering any fuel to its cylinder. Most likely, that carb needs a good cleaning, then you will want to do a proper sync to get them all running the same. Have a look in the technical articles and you'll find lots of good info about cleaning your carbs. For even more, use the phrase 'triple clean' in the search button at the top of the page.

[prometheus578]

"Ken knows of which he speaks."

I'll only add that if #2 is like that, the others are getting there, too. Clean 'em all.

[rizzo4u2]

i did have the carbs off back about 2 months ago ,the bike has not bin ridden much do to fixing other problems, now that they have been resolved now this, i will pull the carbs back off and check no.2 ,everything else seems fine on the others , and the pipes are sizzeling, hot, thanks guys, anything i should look for............

[Czekus21]

XScuse me while I chime to the list. The notorious three time cleaning. After you pull them again and clean them, reinstall em, Sync em, Ya might need to do it all over again. These carbs are notorious for the 3rd time right cleanings. Do a post search and many time over, you'll read the same info about 3rd time right.
Just a 2 cent chime... Now,,, Back to the show....

[mason79]

if i don't ride mine for a while, ( and i do that alot ) it does the same thing, but not with any particular cylinder, it could be random,


i found that the plugs would foul in a hurry if that jug is not firing,
after cleaning the plug or putting in a new one i i let it run on 3 or 2 or what ever,


the heat from the firing cylinders would create warm enuff conditions for the weak non-firing cylinder to catch, i guess it would be hard to start when cold, but now that it's hot, but the surrounding engine, well... different story?


then i run the crap out of it to blow out the engine, kinda like voodoo mechanics.

this has saved me from dismantling the carbs, anything but that....


worked for me

[rizzo4u2]

the plugs are all firing fine, i opened the bowls up today found nothing wrong as i can see, there clean, all bowls are full of fuel, now what.......

[skids]

If you warm the engine ane then twist the throttle to 2000 rpms, does the pipe suddenly start getting hot? I had one that was giving me fits until I found an air leak at the manifold boot/head contact. It really helps to color a set of plugs to see richness at idle, but it would help to get the engine good and hot before you swap for the new plugs.

Originally posted by rizzo4u2
the plugs are all firing fine, i opened the bowls up today found nothing wrong as i can see, there clean, all bowls are full of fuel, now what.......

[mro]

air leak at the manifold boot/head contact

Would also check that the vac cap(s) on the boots not leaking.
Can be deceptive.
Can swap plug into another cylinder to see if plug is failing under load...


mro

[mason79]

mine was firing fine outside as well ,in a compression enviroment the spark was not enough, if the plug is wet with gas you have flooded it if it is dry, well.....starter fluid?

[rizzo4u2]

problems getting better

noticed that number 2 cylinder plug was black, replaced with a new one ran alot better, still as not hot as the others, i was going to put gas filters inline to help the dirt from getting into the carbs, whats a decent gas filter to use, thanks guys.....

[mro]

whats a decent gas filter to use

Cheep...
ones with paper filter seem to filter a little better.


mro

[mason79]

it's so tight in there, almost anything that fits, would be better than nothing, i teed both into one bigger filter, and the crap it filters... well you know....

[firecrackerboom]

I was just seeing what would happen if i took off a spark plug wire one at a time, and when i take off the furthest right one, it didn't do anything to the engine RPMs. If i took off the far left one it pretty much died. Any suggestions?

[AlanB]

Hi FCB,

It means that No4 isn't running. Chances are that the pipe will be a lot cooler than the rest. Spritz water on it.... don't stick a hand on it!

It isn't the coil 'cos the other cylinder fired by the coil is OK.

All the info you need is in V. recent posts.........

AlanB